/
vc-rcs.el
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vc-rcs.el
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;;; vc-rcs.el --- support for RCS version-control
;; Copyright (C) 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000,
;; 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009
;; Free Software Foundation, Inc.
;; Author: FSF (see vc.el for full credits)
;; Maintainer: Andre Spiegel <spiegel@gnu.org>
;; This file is part of GNU Emacs.
;; GNU Emacs is free software: you can redistribute it and/or modify
;; it under the terms of the GNU General Public License as published by
;; the Free Software Foundation, either version 3 of the License, or
;; (at your option) any later version.
;; GNU Emacs is distributed in the hope that it will be useful,
;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
;; GNU General Public License for more details.
;; You should have received a copy of the GNU General Public License
;; along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>.
;;; Commentary:
;; See vc.el
;; Some features will not work with old RCS versions. Where
;; appropriate, VC finds out which version you have, and allows or
;; disallows those features (stealing locks, for example, works only
;; from 5.6.2 onwards).
;; Even initial checkins will fail if your RCS version is so old that ci
;; doesn't understand -t-; this has been known to happen to people running
;; NExTSTEP 3.0.
;;
;; You can support the RCS -x option by customizing vc-rcs-master-templates.
;;; Code:
;;;
;;; Customization options
;;;
(eval-when-compile
(require 'cl)
(require 'vc))
(defcustom vc-rcs-release nil
"The release number of your RCS installation, as a string.
If nil, VC itself computes this value when it is first needed."
:type '(choice (const :tag "Auto" nil)
(string :tag "Specified")
(const :tag "Unknown" unknown))
:group 'vc)
(defcustom vc-rcs-register-switches nil
"Switches for registering a file in RCS.
A string or list of strings passed to the checkin program by
\\[vc-register]. If nil, use the value of `vc-register-switches'.
If t, use no switches."
:type '(choice (const :tag "Unspecified" nil)
(const :tag "None" t)
(string :tag "Argument String")
(repeat :tag "Argument List" :value ("") string))
:version "21.1"
:group 'vc)
(defcustom vc-rcs-diff-switches nil
"String or list of strings specifying switches for RCS diff under VC.
If nil, use the value of `vc-diff-switches'. If t, use no switches."
:type '(choice (const :tag "Unspecified" nil)
(const :tag "None" t)
(string :tag "Argument String")
(repeat :tag "Argument List" :value ("") string))
:version "21.1"
:group 'vc)
(defcustom vc-rcs-header (or (cdr (assoc 'RCS vc-header-alist)) '("\$Id\$"))
"Header keywords to be inserted by `vc-insert-headers'."
:type '(repeat string)
:version "21.1"
:group 'vc)
(defcustom vc-rcsdiff-knows-brief nil
"Indicates whether rcsdiff understands the --brief option.
The value is either `yes', `no', or nil. If it is nil, VC tries
to use --brief and sets this variable to remember whether it worked."
:type '(choice (const :tag "Work out" nil) (const yes) (const no))
:group 'vc)
;;;###autoload
(defcustom vc-rcs-master-templates
(purecopy '("%sRCS/%s,v" "%s%s,v" "%sRCS/%s"))
"Where to look for RCS master files.
For a description of possible values, see `vc-check-master-templates'."
:type '(choice (const :tag "Use standard RCS file names"
'("%sRCS/%s,v" "%s%s,v" "%sRCS/%s"))
(repeat :tag "User-specified"
(choice string
function)))
:version "21.1"
:group 'vc)
;;; Properties of the backend
(defun vc-rcs-revision-granularity () 'file)
(defun vc-rcs-checkout-model (files)
"RCS-specific version of `vc-checkout-model'."
(let ((file (if (consp files) (car files) files))
result)
(when vc-consult-headers
(vc-file-setprop file 'vc-checkout-model nil)
(vc-rcs-consult-headers file)
(setq result (vc-file-getprop file 'vc-checkout-model)))
(or result
(progn (vc-rcs-fetch-master-state file)
(vc-file-getprop file 'vc-checkout-model)))))
;;;
;;; State-querying functions
;;;
;; The autoload cookie below places vc-rcs-registered directly into
;; loaddefs.el, so that vc-rcs.el does not need to be loaded for
;; every file that is visited.
;;;###autoload
(progn
(defun vc-rcs-registered (f) (vc-default-registered 'RCS f)))
(defun vc-rcs-state (file)
"Implementation of `vc-state' for RCS."
(if (not (vc-rcs-registered file))
'unregistered
(or (boundp 'vc-rcs-headers-result)
(and vc-consult-headers
(vc-rcs-consult-headers file)))
(let ((state
;; vc-working-revision might not be known; in that case the
;; property is nil. vc-rcs-fetch-master-state knows how to
;; handle that.
(vc-rcs-fetch-master-state file
(vc-file-getprop file
'vc-working-revision))))
(if (not (eq state 'up-to-date))
state
(if (vc-workfile-unchanged-p file)
'up-to-date
(if (eq (vc-rcs-checkout-model (list file)) 'locking)
'unlocked-changes
'edited))))))
(defun vc-rcs-state-heuristic (file)
"State heuristic for RCS."
(let (vc-rcs-headers-result)
(if (and vc-consult-headers
(setq vc-rcs-headers-result
(vc-rcs-consult-headers file))
(eq vc-rcs-headers-result 'rev-and-lock))
(let ((state (vc-file-getprop file 'vc-state)))
;; If the headers say that the file is not locked, the
;; permissions can tell us whether locking is used for
;; the file or not.
(if (and (eq state 'up-to-date)
(not (vc-mistrust-permissions file))
(file-exists-p file))
(cond
((string-match ".rw..-..-." (nth 8 (file-attributes file)))
(vc-file-setprop file 'vc-checkout-model 'implicit)
(setq state
(if (vc-rcs-workfile-is-newer file)
'edited
'up-to-date)))
((string-match ".r-..-..-." (nth 8 (file-attributes file)))
(vc-file-setprop file 'vc-checkout-model 'locking))))
state)
(if (not (vc-mistrust-permissions file))
(let* ((attributes (file-attributes file 'string))
(owner-name (nth 2 attributes))
(permissions (nth 8 attributes)))
(cond ((and permissions (string-match ".r-..-..-." permissions))
(vc-file-setprop file 'vc-checkout-model 'locking)
'up-to-date)
((and permissions (string-match ".rw..-..-." permissions))
(if (eq (vc-rcs-checkout-model file) 'locking)
(if (file-ownership-preserved-p file)
'edited
owner-name)
(if (vc-rcs-workfile-is-newer file)
'edited
'up-to-date)))
(t
;; Strange permissions. Fall through to
;; expensive state computation.
(vc-rcs-state file))))
(vc-rcs-state file)))))
(defun vc-rcs-dir-status (dir update-function)
;; FIXME: this function should be rewritten or `vc-expand-dirs'
;; should be changed to take a backend parameter. Using
;; `vc-expand-dirs' is not TRTD because it returns files from
;; multiple backends. It should also return 'unregistered files.
;; Doing individual vc-state calls is painful but there
;; is no better way in RCS-land.
(let ((flist (vc-expand-dirs (list dir)))
(result nil))
(dolist (file flist)
(let ((state (vc-state file))
(frel (file-relative-name file)))
(when (and (eq (vc-backend file) 'RCS)
(not (eq state 'up-to-date)))
(push (list frel state) result))))
(funcall update-function result)))
(defun vc-rcs-working-revision (file)
"RCS-specific version of `vc-working-revision'."
(or (and vc-consult-headers
(vc-rcs-consult-headers file)
(vc-file-getprop file 'vc-working-revision))
(progn
(vc-rcs-fetch-master-state file)
(vc-file-getprop file 'vc-working-revision))))
(defun vc-rcs-latest-on-branch-p (file &optional version)
"Return non-nil if workfile version of FILE is the latest on its branch.
When VERSION is given, perform check for that version."
(unless version (setq version (vc-working-revision file)))
(with-temp-buffer
(string= version
(if (vc-rcs-trunk-p version)
(progn
;; Compare VERSION to the head version number.
(vc-insert-file (vc-name file) "^[0-9]")
(vc-parse-buffer "^head[ \t\n]+\\([^;]+\\);" 1))
;; If we are not on the trunk, we need to examine the
;; whole current branch.
(vc-insert-file (vc-name file) "^desc")
(vc-rcs-find-most-recent-rev (vc-branch-part version))))))
(defun vc-rcs-workfile-unchanged-p (file)
"RCS-specific implementation of `vc-workfile-unchanged-p'."
;; Try to use rcsdiff --brief. If rcsdiff does not understand that,
;; do a double take and remember the fact for the future
(let* ((version (concat "-r" (vc-working-revision file)))
(status (if (eq vc-rcsdiff-knows-brief 'no)
(vc-do-command "*vc*" 1 "rcsdiff" file version)
(vc-do-command "*vc*" 2 "rcsdiff" file "--brief" version))))
(if (eq status 2)
(if (not vc-rcsdiff-knows-brief)
(setq vc-rcsdiff-knows-brief 'no
status (vc-do-command "*vc*" 1 "rcsdiff" file version))
(error "rcsdiff failed"))
(if (not vc-rcsdiff-knows-brief) (setq vc-rcsdiff-knows-brief 'yes)))
;; The workfile is unchanged if rcsdiff found no differences.
(zerop status)))
;;;
;;; State-changing functions
;;;
(defun vc-rcs-create-repo ()
"Create a new RCS repository."
;; RCS is totally file-oriented, so all we have to do is make the directory.
(make-directory "RCS"))
(defun vc-rcs-register (files &optional rev comment)
"Register FILES into the RCS version-control system.
REV is the optional revision number for the files. COMMENT can be used
to provide an initial description for each FILES.
Passes either `vc-rcs-register-switches' or `vc-register-switches'
to the RCS command.
Automatically retrieve a read-only version of the file with keywords
expanded if `vc-keep-workfiles' is non-nil, otherwise, delete the workfile."
(let (subdir name)
(dolist (file files)
(and (not (file-exists-p
(setq subdir (expand-file-name "RCS"
(file-name-directory file)))))
(not (directory-files (file-name-directory file)
nil ".*,v$" t))
(yes-or-no-p "Create RCS subdirectory? ")
(make-directory subdir))
(apply 'vc-do-command "*vc*" 0 "ci" file
;; if available, use the secure registering option
(and (vc-rcs-release-p "5.6.4") "-i")
(concat (if vc-keep-workfiles "-u" "-r") rev)
(and comment (concat "-t-" comment))
(vc-switches 'RCS 'register))
;; parse output to find master file name and workfile version
(with-current-buffer "*vc*"
(goto-char (point-min))
(if (not (setq name
(if (looking-at (concat "^\\(.*\\) <-- "
(file-name-nondirectory file)))
(match-string 1))))
;; if we couldn't find the master name,
;; run vc-rcs-registered to get it
;; (will be stored into the vc-name property)
(vc-rcs-registered file)
(vc-file-setprop file 'vc-name
(if (file-name-absolute-p name)
name
(expand-file-name
name
(file-name-directory file))))))
(vc-file-setprop file 'vc-working-revision
(if (re-search-forward
"^initial revision: \\([0-9.]+\\).*\n"
nil t)
(match-string 1))))))
(defun vc-rcs-responsible-p (file)
"Return non-nil if RCS thinks it would be responsible for registering FILE."
;; TODO: check for all the patterns in vc-rcs-master-templates
(file-directory-p (expand-file-name "RCS" (file-name-directory file))))
(defun vc-rcs-receive-file (file rev)
"Implementation of receive-file for RCS."
(let ((checkout-model (vc-rcs-checkout-model (list file))))
(vc-rcs-register file rev "")
(when (eq checkout-model 'implicit)
(vc-rcs-set-non-strict-locking file))
(vc-rcs-set-default-branch file (concat rev ".1"))))
(defun vc-rcs-unregister (file)
"Unregister FILE from RCS.
If this leaves the RCS subdirectory empty, ask the user
whether to remove it."
(let* ((master (vc-name file))
(dir (file-name-directory master))
(backup-info (find-backup-file-name master)))
(if (not backup-info)
(delete-file master)
(rename-file master (car backup-info) 'ok-if-already-exists)
(dolist (f (cdr backup-info)) (ignore-errors (delete-file f))))
(and (string= (file-name-nondirectory (directory-file-name dir)) "RCS")
;; check whether RCS dir is empty, i.e. it does not
;; contain any files except "." and ".."
(not (directory-files dir nil
"^\\([^.]\\|\\.[^.]\\|\\.\\.[^.]\\).*"))
(yes-or-no-p (format "Directory %s is empty; remove it? " dir))
(delete-directory dir))))
(defun vc-rcs-checkin (files rev comment)
"RCS-specific version of `vc-backend-checkin'."
(let ((switches (vc-switches 'RCS 'checkin)))
;; Now operate on the files
(dolist (file (vc-expand-dirs files))
(let ((old-version (vc-working-revision file)) new-version
(default-branch (vc-file-getprop file 'vc-rcs-default-branch)))
;; Force branch creation if an appropriate
;; default branch has been set.
(and (not rev)
default-branch
(string-match (concat "^" (regexp-quote old-version) "\\.")
default-branch)
(setq rev default-branch)
(setq switches (cons "-f" switches)))
(if (and (not rev) old-version)
(setq rev (vc-branch-part old-version)))
(apply 'vc-do-command "*vc*" 0 "ci" (vc-name file)
;; if available, use the secure check-in option
(and (vc-rcs-release-p "5.6.4") "-j")
(concat (if vc-keep-workfiles "-u" "-r") rev)
(concat "-m" comment)
switches)
(vc-file-setprop file 'vc-working-revision nil)
;; determine the new workfile version
(set-buffer "*vc*")
(goto-char (point-min))
(when (or (re-search-forward
"new revision: \\([0-9.]+\\);" nil t)
(re-search-forward
"reverting to previous revision \\([0-9.]+\\)" nil t))
(setq new-version (match-string 1))
(vc-file-setprop file 'vc-working-revision new-version))
;; if we got to a different branch, adjust the default
;; branch accordingly
(cond
((and old-version new-version
(not (string= (vc-branch-part old-version)
(vc-branch-part new-version))))
(vc-rcs-set-default-branch file
(if (vc-rcs-trunk-p new-version) nil
(vc-branch-part new-version)))
;; If this is an old RCS release, we might have
;; to remove a remaining lock.
(if (not (vc-rcs-release-p "5.6.2"))
;; exit status of 1 is also accepted.
;; It means that the lock was removed before.
(vc-do-command "*vc*" 1 "rcs" (vc-name file)
(concat "-u" old-version)))))))))
(defun vc-rcs-find-revision (file rev buffer)
(apply 'vc-do-command
(or buffer "*vc*") 0 "co" (vc-name file)
"-q" ;; suppress diagnostic output
(concat "-p" rev)
(vc-switches 'RCS 'checkout)))
(defun vc-rcs-checkout (file &optional editable rev)
"Retrieve a copy of a saved version of FILE. If FILE is a directory,
attempt the checkout for all registered files beneath it."
(if (file-directory-p file)
(mapc 'vc-rcs-checkout (vc-expand-dirs (list file)))
(let ((file-buffer (get-file-buffer file))
switches)
(message "Checking out %s..." file)
(save-excursion
;; Change buffers to get local value of vc-checkout-switches.
(if file-buffer (set-buffer file-buffer))
(setq switches (vc-switches 'RCS 'checkout))
;; Save this buffer's default-directory
;; and use save-excursion to make sure it is restored
;; in the same buffer it was saved in.
(let ((default-directory default-directory))
(save-excursion
;; Adjust the default-directory so that the check-out creates
;; the file in the right place.
(setq default-directory (file-name-directory file))
(let (new-version)
;; if we should go to the head of the trunk,
;; clear the default branch first
(and rev (string= rev "")
(vc-rcs-set-default-branch file nil))
;; now do the checkout
(apply 'vc-do-command
"*vc*" 0 "co" (vc-name file)
;; If locking is not strict, force to overwrite
;; the writable workfile.
(if (eq (vc-rcs-checkout-model (list file)) 'implicit) "-f")
(if editable "-l")
(if (stringp rev)
;; a literal revision was specified
(concat "-r" rev)
(let ((workrev (vc-working-revision file)))
(if workrev
(concat "-r"
(if (not rev)
;; no revision specified:
;; use current workfile version
workrev
;; REV is t ...
(if (not (vc-rcs-trunk-p workrev))
;; ... go to head of current branch
(vc-branch-part workrev)
;; ... go to head of trunk
(vc-rcs-set-default-branch file
nil)
""))))))
switches)
;; determine the new workfile version
(with-current-buffer "*vc*"
(setq new-version
(vc-parse-buffer "^revision \\([0-9.]+\\).*\n" 1)))
(vc-file-setprop file 'vc-working-revision new-version)
;; if necessary, adjust the default branch
(and rev (not (string= rev ""))
(vc-rcs-set-default-branch
file
(if (vc-rcs-latest-on-branch-p file new-version)
(if (vc-rcs-trunk-p new-version) nil
(vc-branch-part new-version))
new-version)))))
(message "Checking out %s...done" file))))))
(defun vc-rcs-rollback (files)
"Roll back, undoing the most recent checkins of FILES. Directories are
expanded to all registered subfiles in them."
(if (not files)
(error "RCS backend doesn't support directory-level rollback"))
(dolist (file (vc-expand-dirs files))
(let* ((discard (vc-working-revision file))
(previous (if (vc-rcs-trunk-p discard) "" (vc-branch-part discard)))
(config (current-window-configuration))
(done nil))
(if (null (yes-or-no-p (format "Remove version %s from %s history? "
discard file)))
(error "Aborted"))
(message "Removing revision %s from %s." discard file)
(vc-do-command "*vc*" 0 "rcs" (vc-name file) (concat "-o" discard))
;; Check out the most recent remaining version. If it
;; fails, because the whole branch got deleted, do a
;; double-take and check out the version where the branch
;; started.
(while (not done)
(condition-case err
(progn
(vc-do-command "*vc*" 0 "co" (vc-name file) "-f"
(concat "-u" previous))
(setq done t))
(error (set-buffer "*vc*")
(goto-char (point-min))
(if (search-forward "no side branches present for" nil t)
(progn (setq previous (vc-branch-part previous))
(vc-rcs-set-default-branch file previous)
;; vc-do-command popped up a window with
;; the error message. Get rid of it, by
;; restoring the old window configuration.
(set-window-configuration config))
;; No, it was some other error: re-signal it.
(signal (car err) (cdr err)))))))))
(defun vc-rcs-revert (file &optional contents-done)
"Revert FILE to the version it was based on. If FILE is a directory,
revert all registered files beneath it."
(if (file-directory-p file)
(mapc 'vc-rcs-revert (vc-expand-dirs (list file)))
(vc-do-command "*vc*" 0 "co" (vc-name file) "-f"
(concat (if (eq (vc-state file) 'edited) "-u" "-r")
(vc-working-revision file)))))
(defun vc-rcs-merge (file first-version &optional second-version)
"Merge changes into current working copy of FILE.
The changes are between FIRST-VERSION and SECOND-VERSION."
(vc-do-command "*vc*" 1 "rcsmerge" (vc-name file)
"-kk" ; ignore keyword conflicts
(concat "-r" first-version)
(if second-version (concat "-r" second-version))))
(defun vc-rcs-steal-lock (file &optional rev)
"Steal the lock on the current workfile for FILE and revision REV.
If FILE is a directory, steal the lock on all registered files beneath it.
Needs RCS 5.6.2 or later for -M."
(if (file-directory-p file)
(mapc 'vc-rcs-steal-lock (vc-expand-dirs (list file)))
(vc-do-command "*vc*" 0 "rcs" (vc-name file) "-M" (concat "-u" rev))
;; Do a real checkout after stealing the lock, so that we see
;; expanded headers.
(vc-do-command "*vc*" 0 "co" (vc-name file) "-f" (concat "-l" rev))))
(defun vc-rcs-modify-change-comment (files rev comment)
"Modify the change comments change on FILES on a specified REV. If FILE is a
directory the operation is applied to all registered files beneath it."
(dolist (file (vc-expand-dirs files))
(vc-do-command "*vc*" 0 "rcs" (vc-name file)
(concat "-m" rev ":" comment))))
;;;
;;; History functions
;;;
(defun vc-rcs-print-log-cleanup ()
(let ((inhibit-read-only t))
(goto-char (point-max))
(forward-line -1)
(while (looking-at "=*\n")
(delete-char (- (match-end 0) (match-beginning 0)))
(forward-line -1))
(goto-char (point-min))
(when (looking-at "[\b\t\n\v\f\r ]+")
(delete-char (- (match-end 0) (match-beginning 0))))))
(defun vc-rcs-print-log (files buffer &optional shortlog start-revision-ignored limit)
"Get change log associated with FILE. If FILE is a
directory the operation is applied to all registered files beneath it."
(vc-do-command (or buffer "*vc*") 0 "rlog" (mapcar 'vc-name (vc-expand-dirs files)))
(with-current-buffer (or buffer "*vc*")
(vc-rcs-print-log-cleanup))
(when limit 'limit-unsupported))
(defun vc-rcs-diff (files &optional oldvers newvers buffer)
"Get a difference report using RCS between two sets of files."
(apply 'vc-do-command (or buffer "*vc-diff*")
1 ;; Always go synchronous, the repo is local
"rcsdiff" (vc-expand-dirs files)
(append (list "-q"
(and oldvers (concat "-r" oldvers))
(and newvers (concat "-r" newvers)))
(vc-switches 'RCS 'diff))))
(defun vc-rcs-comment-history (file)
"Return a string with all log entries stored in BACKEND for FILE."
(with-current-buffer "*vc*"
;; Has to be written this way, this function is used by the CVS backend too
(vc-call-backend (vc-backend file) 'print-log (list file))
;; Remove cruft
(let ((separator (concat "^-+\nrevision [0-9.]+\ndate: .*\n"
"\\(branches: .*;\n\\)?"
"\\(\\*\\*\\* empty log message \\*\\*\\*\n\\)?")))
(goto-char (point-max)) (forward-line -1)
(while (looking-at "=*\n")
(delete-char (- (match-end 0) (match-beginning 0)))
(forward-line -1))
(goto-char (point-min))
(if (looking-at "[\b\t\n\v\f\r ]+")
(delete-char (- (match-end 0) (match-beginning 0))))
(goto-char (point-min))
(re-search-forward separator nil t)
(delete-region (point-min) (point))
(while (re-search-forward separator nil t)
(delete-region (match-beginning 0) (match-end 0))))
;; Return the de-crufted comment list
(buffer-string)))
(defun vc-rcs-annotate-command (file buffer &optional revision)
"Annotate FILE, inserting the results in BUFFER.
Optional arg REVISION is a revision to annotate from."
(vc-setup-buffer buffer)
;; Aside from the "head revision on the trunk", the instructions for
;; each revision on the trunk are an ordered list of kill and insert
;; commands necessary to go from the chronologically-following
;; revision to this one. That is, associated with revision N are
;; edits that applied to revision N+1 would result in revision N.
;;
;; On a branch, however, (some) things are inverted: the commands
;; listed are those necessary to go from the chronologically-preceding
;; revision to this one. That is, associated with revision N are
;; edits that applied to revision N-1 would result in revision N.
;;
;; So, to get per-line history info, we apply reverse-chronological
;; edits, starting with the head revision on the trunk, all the way
;; back through the initial revision (typically "1.1" or similar),
;; then apply forward-chronological edits -- keeping track of which
;; revision is associated with each inserted line -- until we reach
;; the desired revision for display (which may be either on the trunk
;; or on a branch).
(let* ((tree (with-temp-buffer
(insert-file-contents (vc-rcs-registered file))
(vc-rcs-parse)))
(revisions (cdr (assq 'revisions tree)))
;; The revision N whose instructions we currently are processing.
(cur (cdr (assq 'head (cdr (assq 'headers tree)))))
;; Alist from the parse tree for N.
(meta (cdr (assoc cur revisions)))
;; Point and temporary string, respectively.
p s
;; "Next-branch list". Nil means the desired revision to
;; display lives on the trunk. Non-nil means it lives on a
;; branch, in which case the value is a list of revision pairs
;; (PARENT . CHILD), the first PARENT being on the trunk, that
;; links each series of revisions in the path from the initial
;; revision to the desired revision to display.
nbls
;; "Path-accumulate-predicate plus revision/date/author".
;; Until set, forward-chronological edits are not accumulated.
;; Once set, its value (updated every revision) is used for
;; the text property `:vc-rcs-r/d/a' for inserts during
;; processing of forward-chronological instructions for N.
;; See internal func `r/d/a'.
prda
;; List of forward-chronological instructions, each of the
;; form: (POS . ACTION), where POS is a buffer position. If
;; ACTION is a string, it is inserted, otherwise it is taken as
;; the number of characters to be deleted.
path
;; N+1. When `cur' is "", this is the initial revision.
pre)
(unless revision
(setq revision cur))
(unless (assoc revision revisions)
(error "No such revision: %s" revision))
;; Find which branches (if any) must be included in the edits.
(let ((par revision)
bpt kids)
(while (setq bpt (vc-branch-part par)
par (vc-branch-part bpt))
(setq kids (cdr (assq 'branches (cdr (assoc par revisions)))))
;; A branchpoint may have multiple children. Find the right one.
(while (not (string= bpt (vc-branch-part (car kids))))
(setq kids (cdr kids)))
(push (cons par (car kids)) nbls)))
;; Start with the full text.
(set-buffer buffer)
(insert (cdr (assq 'text meta)))
;; Apply reverse-chronological edits on the trunk, computing and
;; accumulating forward-chronological edits after some point, for
;; later.
(flet ((r/d/a () (vector pre
(cdr (assq 'date meta))
(cdr (assq 'author meta)))))
(while (when (setq pre cur cur (cdr (assq 'next meta)))
(not (string= "" cur)))
(setq
;; Start accumulating the forward-chronological edits when N+1
;; on the trunk is either the desired revision to display, or
;; the appropriate branchpoint for it. Do this before
;; updating `meta' since `r/d/a' uses N+1's `meta' value.
prda (when (or prda (string= (if nbls (caar nbls) revision) pre))
(r/d/a))
meta (cdr (assoc cur revisions)))
;; Edits in the parse tree specify a line number (in the buffer
;; *BEFORE* editing occurs) to start from, but line numbers
;; change as a result of edits. To DTRT, we apply edits in
;; order of descending buffer position so that edits further
;; down in the buffer occur first w/o corrupting specified
;; buffer positions of edits occurring towards the beginning of
;; the buffer. In this way we avoid using markers. A pleasant
;; property of this approach is ability to push instructions
;; onto `path' directly, w/o need to maintain rev boundaries.
(dolist (insn (cdr (assq :insn meta)))
(goto-char (point-min))
(forward-line (1- (pop insn)))
(setq p (point))
(case (pop insn)
(k (setq s (buffer-substring-no-properties
p (progn (forward-line (car insn))
(point))))
(when prda
(push `(,p . ,(propertize s :vc-rcs-r/d/a prda)) path))
(delete-region p (point)))
(i (setq s (car insn))
(when prda
(push `(,p . ,(length s)) path))
(insert s)))))
;; For the initial revision, setting `:vc-rcs-r/d/a' directly is
;; equivalent to pushing an insert instruction (of the entire buffer
;; contents) onto `path' then erasing the buffer, but less wasteful.
(put-text-property (point-min) (point-max) :vc-rcs-r/d/a (r/d/a))
;; Now apply the forward-chronological edits for the trunk.
(dolist (insn path)
(goto-char (pop insn))
(if (stringp insn)
(insert insn)
(delete-char insn)))
;; Now apply the forward-chronological edits (directly from the
;; parse-tree) for the branch(es), if necessary. We re-use vars
;; `pre' and `meta' for the sake of internal func `r/d/a'.
(while nbls
(setq pre (cdr (pop nbls)))
(while (progn
(setq meta (cdr (assoc pre revisions))
prda nil)
(dolist (insn (cdr (assq :insn meta)))
(goto-char (point-min))
(forward-line (1- (pop insn)))
(case (pop insn)
(k (delete-region
(point) (progn (forward-line (car insn))
(point))))
(i (insert (propertize
(car insn)
:vc-rcs-r/d/a
(or prda (setq prda (r/d/a))))))))
(prog1 (not (string= (if nbls (caar nbls) revision) pre))
(setq pre (cdr (assq 'next meta)))))))))
;; Lastly, for each line, insert at bol nicely-formatted history info.
;; We do two passes to collect summary information used to minimize
;; the annotation's usage of screen real-estate: (1) Consider rendered
;; width of revision plus author together as a unit; and (2) Omit
;; author entirely if all authors are the same as the user.
(let ((ht (make-hash-table :test 'eq))
(me (user-login-name))
(maxw 0)
(all-me t)
rda w a)
(goto-char (point-max))
(while (not (bobp))
(forward-line -1)
(setq rda (get-text-property (point) :vc-rcs-r/d/a))
(unless (gethash rda ht)
(setq a (aref rda 2)
all-me (and all-me (string= a me)))
(puthash rda (setq w (+ (length (aref rda 0))
(length a)))
ht)
(setq maxw (max w maxw))))
(let ((padding (make-string maxw 32)))
(flet ((pad (w) (substring-no-properties padding w))
(render (rda &rest ls)
(propertize
(apply 'concat
(format-time-string "%Y-%m-%d" (aref rda 1))
" "
(aref rda 0)
ls)
:vc-annotate-prefix t
:vc-rcs-r/d/a rda)))
(maphash
(if all-me
(lambda (rda w)
(puthash rda (render rda (pad w) ": ") ht))
(lambda (rda w)
(puthash rda (render rda " " (pad w) " " (aref rda 2) ": ") ht)))
ht)))
(while (not (eobp))
(insert (gethash (get-text-property (point) :vc-rcs-r/d/a) ht))
(forward-line 1))))
(declare-function vc-annotate-convert-time "vc-annotate" (time))
(defun vc-rcs-annotate-current-time ()
"Return the current time, based at midnight of the current day, and
encoded as fractional days."
(vc-annotate-convert-time
(apply 'encode-time 0 0 0 (nthcdr 3 (decode-time (current-time))))))
(defun vc-rcs-annotate-time ()
"Return the time of the next annotation (as fraction of days)
systime, or nil if there is none. Also, reposition point."
(unless (eobp)
(prog1 (vc-annotate-convert-time
(aref (get-text-property (point) :vc-rcs-r/d/a) 1))
(goto-char (next-single-property-change (point) :vc-annotate-prefix)))))
(defun vc-rcs-annotate-extract-revision-at-line ()
(aref (get-text-property (point) :vc-rcs-r/d/a) 0))
;;;
;;; Tag system
;;;
(defun vc-rcs-create-tag (backend dir name branchp)
(when branchp
(error "RCS backend %s does not support module branches" backend))
(let ((result (vc-tag-precondition dir)))
(if (stringp result)
(error "File %s is not up-to-date" result)
(vc-file-tree-walk
dir
(lambda (f)
(vc-do-command "*vc*" 0 "rcs" (vc-name f) (concat "-n" name ":")))))))
;;;
;;; Miscellaneous
;;;
(defun vc-rcs-trunk-p (rev)
"Return t if REV is a revision on the trunk."
(not (eq nil (string-match "\\`[0-9]+\\.[0-9]+\\'" rev))))
(defun vc-rcs-minor-part (rev)
"Return the minor revision number of a revision number REV."
(string-match "[0-9]+\\'" rev)
(substring rev (match-beginning 0) (match-end 0)))
(defun vc-rcs-previous-revision (file rev)
"Return the revision number immediately preceding REV for FILE,
or nil if there is no previous revision. This default
implementation works for MAJOR.MINOR-style revision numbers as
used by RCS and CVS."
(let ((branch (vc-branch-part rev))
(minor-num (string-to-number (vc-rcs-minor-part rev))))
(when branch
(if (> minor-num 1)
;; revision does probably not start a branch or release
(concat branch "." (number-to-string (1- minor-num)))
(if (vc-rcs-trunk-p rev)
;; we are at the beginning of the trunk --
;; don't know anything to return here
nil
;; we are at the beginning of a branch --
;; return revision of starting point
(vc-branch-part branch))))))
(defun vc-rcs-next-revision (file rev)
"Return the revision number immediately following REV for FILE,
or nil if there is no next revision. This default implementation
works for MAJOR.MINOR-style revision numbers as used by RCS
and CVS."
(when (not (string= rev (vc-working-revision file)))
(let ((branch (vc-branch-part rev))
(minor-num (string-to-number (vc-rcs-minor-part rev))))
(concat branch "." (number-to-string (1+ minor-num))))))
(defun vc-rcs-update-changelog (files)
"Default implementation of update-changelog.
Uses `rcs2log' which only works for RCS and CVS."
;; FIXME: We (c|sh)ould add support for cvs2cl
(let ((odefault default-directory)
(changelog (find-change-log))
;; Presumably not portable to non-Unixy systems, along with rcs2log:
(tempfile (make-temp-file
(expand-file-name "vc"
(or small-temporary-file-directory
temporary-file-directory))))
(login-name (or user-login-name
(format "uid%d" (number-to-string (user-uid)))))
(full-name (or add-log-full-name
(user-full-name)
(user-login-name)
(format "uid%d" (number-to-string (user-uid)))))
(mailing-address (or add-log-mailing-address
user-mail-address)))
(find-file-other-window changelog)
(barf-if-buffer-read-only)
(vc-buffer-sync)
(undo-boundary)
(goto-char (point-min))
(push-mark)
(message "Computing change log entries...")
(message "Computing change log entries... %s"
(unwind-protect
(progn
(setq default-directory odefault)
(if (eq 0 (apply 'call-process
(expand-file-name "rcs2log"
exec-directory)
nil (list t tempfile) nil
"-c" changelog
"-u" (concat login-name
"\t" full-name
"\t" mailing-address)
(mapcar
(lambda (f)
(file-relative-name
(expand-file-name f odefault)))
files)))
"done"
(pop-to-buffer (get-buffer-create "*vc*"))
(erase-buffer)
(insert-file-contents tempfile)
"failed"))
(setq default-directory (file-name-directory changelog))
(delete-file tempfile)))))
(defun vc-rcs-check-headers ()
"Check if the current file has any headers in it."
(save-excursion
(goto-char (point-min))
(re-search-forward "\\$[A-Za-z\300-\326\330-\366\370-\377]+\
\\(: [\t -#%-\176\240-\377]*\\)?\\$" nil t)))
(defun vc-rcs-clear-headers ()
"Implementation of vc-clear-headers for RCS."
(let ((case-fold-search nil))
(goto-char (point-min))
(while (re-search-forward
(concat "\\$\\(Author\\|Date\\|Header\\|Id\\|Locker\\|Name\\|"
"RCSfile\\|Revision\\|Source\\|State\\): [^$\n]+\\$")
nil t)
(replace-match "$\\1$"))))
(defun vc-rcs-rename-file (old new)
;; Just move the master file (using vc-rcs-master-templates).
(vc-rename-master (vc-name old) new vc-rcs-master-templates))
(defun vc-rcs-find-file-hook ()
;; If the file is locked by some other user, make
;; the buffer read-only. Like this, even root
;; cannot modify a file that someone else has locked.
(and (stringp (vc-state buffer-file-name 'RCS))
(setq buffer-read-only t)))
;;;
;;; Internal functions
;;;
(defun vc-rcs-workfile-is-newer (file)
"Return non-nil if FILE is newer than its RCS master.
This likely means that FILE has been changed with respect
to its master version."
(let ((file-time (nth 5 (file-attributes file)))
(master-time (nth 5 (file-attributes (vc-name file)))))
(or (> (nth 0 file-time) (nth 0 master-time))
(and (= (nth 0 file-time) (nth 0 master-time))
(> (nth 1 file-time) (nth 1 master-time))))))
(defun vc-rcs-find-most-recent-rev (branch)
"Find most recent revision on BRANCH."
(goto-char (point-min))
(let ((latest-rev -1) value)
(while (re-search-forward (concat "^\\(" (regexp-quote branch)
"\\.\\([0-9]+\\)\\)\ndate[ \t]+[0-9.]+;")
nil t)
(let ((rev (string-to-number (match-string 2))))
(when (< latest-rev rev)
(setq latest-rev rev)
(setq value (match-string 1)))))
(or value
(vc-branch-part branch))))
(defun vc-rcs-fetch-master-state (file &optional working-revision)
"Compute the master file's idea of the state of FILE.
If a WORKING-REVISION is given, compute the state of that version,
otherwise determine the workfile version based on the master file.
This function sets the properties `vc-working-revision' and
`vc-checkout-model' to their correct values, based on the master
file."
(with-temp-buffer
(if (or (not (vc-insert-file (vc-name file) "^[0-9]"))
(progn (goto-char (point-min))
(not (looking-at "^head[ \t\n]+[^;]+;$"))))
(error "File %s is not an RCS master file" (vc-name file)))
(let ((workfile-is-latest nil)
(default-branch (vc-parse-buffer "^branch[ \t\n]+\\([^;]*\\);" 1)))
(vc-file-setprop file 'vc-rcs-default-branch default-branch)
(unless working-revision
;; Workfile version not known yet. Determine that first. It
;; is either the head of the trunk, the head of the default
;; branch, or the "default branch" itself, if that is a full
;; revision number.
(cond
;; no default branch
((or (not default-branch) (string= "" default-branch))
(setq working-revision
(vc-parse-buffer "^head[ \t\n]+\\([^;]+\\);" 1))
(setq workfile-is-latest t))
;; default branch is actually a revision